21100213112 has 16 divisors (see below), whose sum is σ = 43159527000. Its totient is φ = 9591005920.

The previous prime is 21100213109. The next prime is 21100213139. The reversal of 21100213112 is 21131200112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119887487 + ... + 119887662.

Almost surely, 2^21100213112 is an apocalyptic number.

21100213112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21100213112 is an abundant number, since it is smaller than the sum of its proper divisors (22059313888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100213112 is a wasteful number, since it uses less digits than its factorization.

21100213112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239775166 (or 239775162 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21100213112 its reverse (21131200112), we get a palindrome (42231413224).

The spelling of 21100213112 in words is "twenty-one billion, one hundred million, two hundred thirteen thousand, one hundred twelve".